题目内容：

.We are not sure if it ______ when we have our school sports meeting tomorrow.
A) rain B) rains C) has rained D) will rain

优质解答

We are not sure if it ___will rain___ when we have our school sports meeting tomorrow.
主句是一般现在时,从句根据实际选择合适的时态.这里tomorrow,所以将来时.